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Full text of "Mathematical And Physical Papers - Iii"

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108     ON THE  EFFECT  OF  THE  INTERNAL  FRICTION  OF FLUIDS
Dubuat's experiments on this subject consist of 44 experiments on spheres oscillating in water (Tom. II. p. 236) ; 31 experiments on other solids oscillating in water (p. 246); and 3 experiments on spheres oscillating in air (p. 283). The following table contains a comparison of the formula (148) with Dubuat's results for spheres oscillating in water. The value of v ' yt employed in the calculation is 0*0564 inch English, or 0*05291 inch French.
Dubuat's experiments on spheres oscillating in water.
	IX		
T	^                                       ->, calc.             obs.             diff.		
Sphere of lead                               f t Diameter 1-0113 inches                 j « Weight in water 2102 grains       ( ^	1-633 1*687 1-766 1-825	1-502 1-502 1-522 1-620	- 131 ~*185 -•244 -•205
Sphere of glass                               ( 2	1-602	1-518	-•084
Diameter 2*645 inches                   < 4	1-644	1-569	-•075
Weight in water 574 grains          ( 6	1-676	1-598	-•078
f 1	1-572	1-515	-•057
Same sphere weighing in water   J 2	1-602	1-516	-•086
2102 grains                                   ] 3	1-624	1-523	-•101
U	1-644	1-546	-•098
(1	1-572	1-537	- *035
Same sphere weighing in water   ] 2	1-602	1-523	-•079
4204 grains                                  1 3	1-624	1-524	-•100
U	1-644	1-538	-•106
ft	1-551	1-449	-•102
Same sphere weighing in water   I 1	1-572	1-372	-•200
9216 grains                                    ] 2	1-602	1-494	-•108
(3	1-624	1-494	-•130
12 « 4 Q	1-566 1-581 1-593 1-614	1-507 1-547 1-547 1-567	- -059 -•034 -•046 -•057
I      \	1-547	1-375	-•172
2 Same sphere weighing in water    I ~ 4204 grains                                   ]   .	1-566 1-581 1-593	1-456 1-525 1557	-•no -•056 - -036
-6	1-614	1-549	- '065
(1	1-547	1-57	-f'023
Same sphere weighing in water   J 2	1-566	1-553	-•013
9216 grains                                  1 3	1-581	1-59	+ •009
U	1-593	1-583	-•010